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Staged control of domestic hot water storage tanks to support district heating efficiency

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  • Tahiri, Abdelkarim
  • Smith, Kevin Michael
  • Thorsen, Jan Eric
  • Hviid, Christian Anker
  • Svendsen, Svend

Abstract

Storage tanks are commonly used for domestic hot water (DHW) preparation in large buildings supplied by district heating (DH), especially to cope with peak demand. The charging control of DHW tank systems is often suboptimal, increasing return temperatures and harming the overall DH operation efficiency. This paper presents two novel control concepts to optimize DHW tank charging, satisfying comfort and hygienic requirements without leading to excessive DH flows. The first, more complex control concept employs the smart energy meter sometimes used for DHW billing. It inspired the development of a second, broadly implementable control concept employing a staged proportional gain with an added temperature sensor. The authors tested and refined this staged-gain concept using a validated Modelica model of a real DHW system in a Danish multistory residential building. The authors subsequently implemented the staged-gain control concept in the field, successfully reducing the energy-weighted DH return temperature by 7 °C and the total DH flow by 23.6% compared to the conventional thermostatic control. This analysis accounted for the variation in DHW tapping, DHW temperature, DH supply temperature, and cold water temperature. Furthermore, the performance was robust to relaxed settings of the valve constraints, demonstrating minimal configuration requirements for new implementations.

Suggested Citation

  • Tahiri, Abdelkarim & Smith, Kevin Michael & Thorsen, Jan Eric & Hviid, Christian Anker & Svendsen, Svend, 2023. "Staged control of domestic hot water storage tanks to support district heating efficiency," Energy, Elsevier, vol. 263(PB).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222023751
    DOI: 10.1016/j.energy.2022.125493
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    References listed on IDEAS

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    2. Anna Vannahme & Jonas Busch & Mathias Ehrenwirth & Tobias Schrag, 2023. "Experimental Study of District Heating Substations in a Hardware-in-the-Loop Test Rig," Resources, MDPI, vol. 12(4), pages 1-13, March.

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